Design of a Four-Phase High Frequency Amplitude-Stable Power Supply

This paper presents a four-phase high frequency amplitude-stable power supply that acts as a rotary electric field generator in biochip research and development. Four channels of high precision frequency signals are generated by DDS(Direct Digital Synthesis). Via two-stage amplifiers these signals are amplified to 50 Vp-p output within 100 Hz–100 MHz bandwidth on standard 50 Ω load. Via amplitude and phase detection feedback, the output amplitude and phase errors among multiple channels can be stabilized even if load is changeable.